CN116572498A - Extrusion screw device for blow molding machine - Google Patents
Extrusion screw device for blow molding machine Download PDFInfo
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- CN116572498A CN116572498A CN202310856774.3A CN202310856774A CN116572498A CN 116572498 A CN116572498 A CN 116572498A CN 202310856774 A CN202310856774 A CN 202310856774A CN 116572498 A CN116572498 A CN 116572498A
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- screw
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- feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/287—Raw material pre-treatment while feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to the technical field of plastic molding, in particular to an extrusion screw device for a blow molding machine, which comprises: the feeding screw is used for mixing plastic raw materials to form a primary mixed material; the feeding bin is used for receiving the primary mixed material and heating the primary mixed material; a mixing screw for refining the primary mix; the mixing bin is used for receiving the refined materials and heating the refined materials; a discharge screw for extruding the blow molding material into a mold; the temperature controller is used for detecting and adjusting the temperature of the feeding bin and the mixing bin; the screw support frame is used for lifting and lowering each part respectively; and the controller is used for controlling the lifting of the screw support frame according to a preset lifting strategy and adjusting the temperature of the feeding bin and the mixing bin according to the temperature of the discharging screw. The invention has the advantages that the structure is provided, the discharging stability of the extrusion screw device is effectively improved, and meanwhile, the buffer space is provided, so that the controllability of the extrusion screw device is effectively improved.
Description
Technical Field
The invention relates to the technical field of plastic molding, in particular to an extrusion screw device for a blow molding machine.
Background
The extrusion screw device is an important front part of the operation of the blow molding machine, and plays a very important role in the field of plastic molding, however, in operation, if the equipment is suspended, a large amount of waste materials can remain in the extrusion screw device, and a large amount of cleaning work can be generated when the machine is restarted, which is extremely unfavorable for production.
Chinese application publication No.: CN115256864a discloses a multi-screw co-extrusion blow molding machine, which relates to the technical field of blow molding. This multi-screw coextrusion blow molding machine, include the forming mechanism with a plurality of extruders intercommunication, the extruder has the barrel, the extruder outside is provided with wiper mechanism, wiper mechanism has evenly distributed in a plurality of cloth liquid subassemblies in the extruder outside, cloth liquid subassembly includes mounting panel and cloth liquid pipe, cloth liquid pipe outside is provided with a plurality of compound nails, compound nails include the cavity nail, a plurality of first side openings have evenly been seted up on the lateral wall of cavity nail lower part, a plurality of first bottom openings have evenly been seted up in the one end outside that the cavity nail is close to the barrel, set up the second side opening that corresponds with first side opening on the nail shell lateral wall, the nail shell is close to the one end center department of barrel and has seted up the second bottom opening. The composite nails are installed through original kneading pin installation holes of the extruder, the morphology of the composite nails changes during cleaning, a plurality of groups of composite nails are matched with the inner cavity of the machine barrel to clean the extruder with complex structure, and the cleaning effect is obviously improved.
Chinese patent grant bulletin number: CN218429886U discloses a blowing screw rod with reinforced structure, organism bolted connection is in base top outer wall, mount bolted connection is in base top outer wall, base outer wall one side bolted connection has the frame, the inside motor that is equipped with of frame, and motor output end bolted connection has the screw rod, the screw rod outer wall is the cone, organism outer wall welded connection has four reinforcing bars, conical screw rod has increased the surface area in the use while the conical end has promoted the structural strength of screw rod, four reinforcing bars of organism outer wall welded connection are used for realizing the support function, be used for promoting the main body structural strength of organism, when having solved screw rod extrusion in-process appearance deformation or crooked, will influence screw rod rotation function greatly, thereby influence the problem of discharging after the plastics extrusion.
However, the above method has the following problems:
1) The generation of waste cannot be reduced when the blow molding machine stops working;
2) The discharge efficiency of the extrusion screw cannot be controlled.
Disclosure of Invention
Therefore, the invention provides an extrusion screw device for a blow molding machine, which is used for solving the problems that the generation of waste materials cannot be reduced when the blow molding machine stops working, the discharging efficiency of the extrusion screw cannot be controlled, and the screw machine is sticky in use, so that the controllability of the extrusion screw device is reduced.
To achieve the above object, the present invention provides an extrusion screw apparatus for a blow molding machine, comprising:
the feeding screw is provided with threads according to a feeding strategy and is used for mixing plastic raw materials to form a primary mixed material;
the feeding bin is arranged at the tail end of the feeding screw rod and used for receiving the primary mixed material and heating the primary mixed material by a first heating strategy;
the mixing screw is connected with the feeding bin, and threads are arranged in a mixing strategy to refine the primary mixed material so as to form refined material;
the mixing bin is arranged at the bottom of the mixing screw and used for receiving the refined material and heating the refined material by a second heating strategy;
the discharging screw is connected with the mixing bin, is provided with threads according to a preset discharging strategy, and is used for extruding the refined materials to form blown plastics and extruding the blown plastics into a die;
the temperature controller is connected with the feeding screw, the feeding bin, the mixing screw, the mixing bin and the discharging screw and used for detecting and adjusting the temperature of the feeding bin and the mixing bin;
the screw support frame is a step-shaped support and is used for supporting the feeding screw, the feeding bin, the mixing screw, the mixing bin and the discharging screw, and the screw support frame can respectively lift all parts by a preset lifting strategy;
and the controller is connected with the temperature controller and the screw supporting frame, and is used for controlling the lifting of the screw supporting frame according to a preset lifting strategy and adjusting the temperature of the feeding bin and the mixing bin according to the temperature of the discharging screw.
Further, the feeding strategy is to set the thread shape and the pitch of the threads according to the average particle size of the plastic raw material and the average particle size of the primary mixing material, the mixing strategy is to set the pitch of the threads according to the average particle size of the primary mixing material and the average particle size of the fine mixing material, the first heating strategy is to adjust the temperature of the feeding bin according to the temperature of the feeding screw and the temperature of the mixing screw, the second heating strategy is to adjust the temperature of the mixing bin according to the temperature of the mixing screw and the temperature of the discharging screw, the fine mixing is to reduce the average particle size of the primary mixing material in a cutting and extrusion mode, and the preset lifting strategy is to adjust the height difference between each screw and each bin according to the working efficiency of each screw and the blow molding machine;
wherein, for the feeding strategy, the thread form angle of the corresponding thread is in direct proportion to the hardness of the plastic raw material, the pitch of the thread is in direct proportion to the average particle size of the plastic raw material, and for the mixing strategy, the pitch of the corresponding thread is in direct proportion to the average particle size of the primary mixing material.
Further, the screws are provided with heaters in the screws and in the shell, and the screws can open the shell from the horizontal direction;
when the screw threads of each screw rod are arranged, the screw thread interval from the material inlet end to the material outlet end is uniformly reduced in the corresponding screw thread interval according to the distance between the screw thread interval and the material outlet end;
the thread interval is an interval between the maximum thread interval and the minimum thread interval of each screw rod.
Further, the feeding screw sets the pitch of the screw threads according to the average grain size of the plastic raw material and the average grain size of the primary mixing material, wherein the maximum pitch of the screw threads corresponds to the average grain size of the plastic raw material, and the minimum pitch of the screw threads corresponds to the average grain size of the primary mixing material;
the mixing screw is used for setting the pitch of the screw threads according to the average grain size of the primary mixing material and the average grain size of the refining material, wherein the maximum pitch of the screw threads corresponds to the average grain size of the primary mixing material, and the minimum pitch of the screw threads corresponds to the average grain size of the refining material.
Further, the feeding bin comprises a feeding hole and a discharging hole, wherein the feeding hole is arranged at the tail end of the feeding screw rod and sleeved on the feeding screw rod, and the discharging hole is arranged at the bottom of the feeding bin and is connected with the material inlet end of the mixing screw rod.
Further, the mixing bin comprises a mixing funnel and a cleaning plate, wherein the top of the mixing funnel is arranged at the bottom of the tail end of the mixing screw and is used for receiving the refined materials, the bottom of the mixing funnel is connected with the material inlet end of the discharging screw and is provided with a valve for closing under the working efficiency of suspending operation so as to save raw materials, and the cleaning plate is arranged in the mixing funnel and is of a screw-shaped structure and is used for extruding the refined materials into the discharging screw;
and the work efficiency of the pause work is that the blow molding machine stops working.
Further, the temperature controller adjusts the temperature of the feeding bin to an average value of the temperature of the material output end of the feeding screw and the temperature of the material input end of the mixing screw under the first heating strategy;
and the temperature controller adjusts the temperature of the mixing bin to an average value of the temperature of the material output end of the mixing screw and the temperature of the material input end of the discharging screw under the second heating strategy.
Further, a first preset height difference and a second preset height difference are arranged in the controller, wherein the first preset height difference is smaller than the second preset height difference, and height difference adjustment is controlled to be carried out on the height difference of the feeding bin and the mixing screw according to the average particle size of the plastic raw materials so as to accelerate mixing of the plastic raw materials;
the second preset height difference corresponds to the maximum average particle size of the plastic raw material, the first preset height difference corresponds to the average particle size of the primary mixing material, and the height difference is adjusted in proportion between the first preset height difference and the second preset height difference.
Further, a first preset inclination angle and a second preset inclination angle are arranged in the controller, wherein the first preset inclination angle is smaller than the second preset inclination angle, the inclination modes of the first preset inclination angle and the second preset inclination angle take the material output end of the mixing screw as an origin, the first preset inclination angle is a negative value, and the controller adjusts the mixing screw to a corresponding inclination angle according to the height difference so as to avoid the blockage of the primary mixing material in the mixing screw;
the first preset inclination angle corresponds to the second preset height difference, the second preset inclination angle corresponds to the first preset height difference, and the value of the inclination angle is inversely proportional to the value of the height difference and corresponds to the first preset height difference in proportion.
Further, the controller adjusts the inclination angle of the discharging screw according to the working efficiency of the blow molding machine to adjust the discharging speed, wherein,
if the working efficiency of the blow molding machine is greater than the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is low, and adjusts the inclination of the discharging screw to the second preset inclination with the material output end of the discharging screw as an origin;
if the working efficiency of the blow molding machine is the same as the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is in a reasonable range;
if the working efficiency of the blow molding machine is smaller than the efficiency of the plastic raw materials fed into the feeding screw, the controller judges that the discharging speed of the discharging screw is high, and adjusts the inclination of the discharging screw to the second preset inclination taking the material input end of the discharging screw as an origin.
Compared with the prior art, the invention has the beneficial effects that by arranging the feeding screw, the feeding bin, the mixing screw, the mixing bin, the discharging screw, the temperature controller, the screw support frame and the controller, the discharging stability of the extrusion screw device is effectively improved, and meanwhile, the buffer space is provided, so that the controllability of the extrusion screw device is effectively improved.
Further, by means of setting the feeding strategy and the mixing strategy, the working efficiency of the screw is effectively improved, and meanwhile, sticking and clamping caused by overlarge material particle size are avoided, so that the controllability of the extrusion screw device is further improved.
Further, through the mode that sets up the heater simultaneously inside and outside the screw rod, fully heat the raw materials, when effectively having avoided the bonding material, promoted the plasticity of raw materials to the controllability of extruding screw device has further been promoted.
Further, through the arrangement of the thread spacing, the extrusion efficiency of materials is effectively improved, and meanwhile, the qualification rate of raw materials is improved, so that the controllability of the extrusion screw device is further improved.
Further, through setting up the mode of putting into the feed bin, cushion the processing progress of material to heat the plasticity of promotion material to the material, when effectively having avoided leading to producing the waste material because of the raw materials is carried too soon, further promoted the controllability of extruding screw device.
Further, by setting the mixing bin, the materials are stored and a valve is provided to prevent damage to the end extrusion screw device from stopping production, thereby further improving the controllability of the extrusion screw device.
Furthermore, by heating the feeding bin and the mixing bin, the plasticity of the materials is improved, and meanwhile, the controllability of the extrusion screw device is further improved.
Further, through the mode of adjusting the height and the angle of the screw machine, the discharging speed is controlled on the premise of unchanged feeding speed, and the problems of sticking and clamping of the extrusion screw device are effectively eliminated, so that the controllability of the extrusion screw device is further improved.
Drawings
FIG. 1 is a schematic view of the structure of an extrusion screw apparatus of the present invention;
FIG. 2 is a cross-sectional view of a feed screw according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a loading bin according to an embodiment of the invention;
FIG. 4 is a cross-sectional view of a mixing cartridge according to an embodiment of the invention;
wherein: 1, a feeding screw; 11, feeding a screw material inlet end; 12, front section threads; 13, terminal threads; 14, feeding the output end of the screw rod material; 2, feeding into a storage bin; 21, a bin; 22, a discharge hole; 3, mixing a screw; 4, mixing bin; 41, a mixing funnel; 42, cleaning the plate; 5, a discharging screw; 6, a screw supporting frame; 61, support legs.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a schematic structural diagram of an extrusion screw device of the present invention, an extrusion screw device for a blow molding machine, comprising:
a feeding screw 1, which is provided with threads according to a feeding strategy and is used for mixing plastic raw materials to form a primary mixed material;
the feeding bin 2 is arranged at the tail end of the feeding screw 1 and is used for receiving the primary mixed material and heating the primary mixed material by a first heating strategy;
the mixing screw 3 is connected with the feeding bin 2, and is provided with threads according to a mixing strategy, so as to refine the primary mixed material to form refined material;
the mixing bin 4 is arranged at the bottom of the mixing screw 3 and is used for receiving the refined materials and heating the refined materials by a second heating strategy;
the discharging screw 5 is connected with the mixing bin 4, is provided with threads according to a preset discharging strategy, and is used for extruding the refined materials to form blown plastics and extruding the blown plastics into a die;
the temperature controller is connected with the feeding screw 1, the feeding bin 2, the mixing screw 3, the mixing bin 4 and the discharging screw 5 and is used for detecting and adjusting the temperature of the feeding bin and the mixing bin;
the screw support frame 6 is a step-shaped support and is used for supporting a feeding screw, a feeding bin, a mixing screw, a mixing bin and a discharging screw, and the screw support frame 6 can respectively lift all parts by a preset lifting strategy;
wherein, the screw support frame 6 is provided with a plurality of support legs 61 which can stretch and retract to independently lift and lower each part;
and the controller is connected with the temperature controller and the screw supporting frame and is used for controlling the lifting of the screw supporting frame according to a preset lifting strategy and adjusting the temperature of the feeding bin and the mixing bin according to the temperature of the discharging screw.
According to the invention, by arranging the feeding screw, the feeding bin, the mixing screw, the mixing bin, the discharging screw, the temperature controller, the screw support frame and the controller, the discharging stability of the extrusion screw device is effectively improved, and meanwhile, a buffer space is provided, so that the controllability of the extrusion screw device is effectively improved.
Specifically, the feeding strategy is to set the thread shape and the pitch of threads according to the average particle size of the plastic raw material and the average particle size of the primary mixing material, the mixing strategy is to set the pitch of the threads according to the average particle size of the primary mixing material, the first heating strategy is to adjust the temperature of a feeding bin according to the temperature of a feeding screw and the temperature of a mixing screw, the second heating strategy is to adjust the temperature of the mixing bin according to the temperature of the mixing screw and the temperature of a discharging screw, the refining is to reduce the average particle size of the primary mixing material in a cutting and extruding mode, and the preset lifting strategy is to adjust the height difference between each screw and each bin according to the working efficiency of each screw and a blow molding machine;
wherein, for the feeding strategy, the thread angle of the corresponding thread is in direct proportion to the hardness of the plastic raw material, the pitch of the thread is in direct proportion to the average particle size of the plastic raw material, and for the mixing strategy, the pitch of the corresponding thread is in direct proportion to the average particle size of the primary mixing material.
By means of the feeding strategy and the mixing strategy, the working efficiency of the screw is effectively improved, and meanwhile, sticking and clamping caused by overlarge particle size of materials are avoided, so that the controllability of the extrusion screw device is further improved.
Specifically, each screw is provided with a heater in the screw and in the housing, and each screw can open the housing from the horizontal direction;
when the screw threads of each screw rod are arranged, the screw thread interval from the material inlet end to the material outlet end is uniformly reduced in the corresponding screw thread interval according to the distance between the screw thread interval and the material outlet end;
the thread interval is the interval between the maximum thread interval and the minimum thread interval of each screw rod.
Through the mode that sets up the heater simultaneously inside and outside the screw rod, fully heat the raw materials, when effectively having avoided the bonding material, promoted the plasticity of raw materials to the controllability of extruding screw device has further been promoted.
Taking a feeding screw as an example, please refer to fig. 2, which is a cross-sectional view of the feeding screw according to an embodiment of the present invention, wherein the feeding screw 1 sets the thread profile and the pitch according to the average particle size of the plastic raw material and the average particle size of the primary material according to a feeding strategy, wherein the thread profile is transited from trapezoid to tooth profile, the maximum thread pitch corresponds to the average particle size of the plastic raw material, and the minimum thread pitch corresponds to the average particle size of the primary material;
the plastic raw material enters the feeding screw 1 from the feeding screw material inlet end 11, the front thread 12 is a trapezoidal thread, the mechanical resistance is strong, the tail thread 13 is a toothed thread, the crushing capacity is strong, the distance between the front thread 12 is larger than that between the tail threads 13, and when the material is mixed into a primary mixed material in the feeding screw 1, the material is positioned at the feeding screw material outlet end 14 and enters the feeding bin;
the mixing screw sets the pitch of the screw threads according to the average particle size of the primary mixing material and the average particle size of the refining material according to a mixing strategy, wherein the maximum pitch of the screw threads corresponds to the average particle size of the primary mixing material, and the minimum pitch of the screw threads corresponds to the average particle size of the refining material to be prepared by the mixing screw.
Through the arrangement of the thread spacing, the extrusion efficiency of materials is effectively improved, and meanwhile, the qualification rate of raw materials is improved, so that the controllability of the extrusion screw device is further improved.
Referring to fig. 3, which is a cross-sectional view of a feeding bin according to an embodiment of the present invention, the feeding bin 2 includes a feeding hole and a discharging hole 22, and includes a bin 21 with an arc structure to enable materials to rapidly enter the mixing screw, wherein the feeding hole is disposed at the end of the feeding screw and sleeved on the feeding screw, and the discharging hole 22 is disposed at the bottom of the feeding bin and connected to the material inlet end of the mixing screw.
Through the mode that sets up into the feed bin, cushion the processing progress of material to heat the plasticity that promotes the material to the material, when effectively having avoided leading to producing the waste material because of the raw materials is carried soon, further promoted the controllability of extruding screw device.
Referring to fig. 4, in a cross-sectional view of a mixing bin according to an embodiment of the present invention, the mixing bin 4 includes a mixing funnel 41 and a cleaning plate 42, wherein a top of the mixing funnel 41 is disposed at a bottom of a tail end of a mixing screw for receiving refined materials, the bottom of the mixing funnel 41 is connected to a material inlet end of a discharging screw, a valve is disposed for closing the mixing funnel under a suspension operation working efficiency to save raw materials, and the cleaning plate 42 is disposed in the mixing funnel and has a screw-shaped structure for extruding the refined materials into the discharging screw;
wherein, the work efficiency of the pause work is that the blow molding machine stops working.
Through the mode that sets up the mixing bin, store the material to set up the valve in order to prevent to stop producing the damage to terminal extrusion screw device, thereby further promoted extrusion screw device's controllability.
Specifically, the temperature controller adjusts the temperature of the feeding bin to an average value of the temperature of the material output end of the feeding screw and the temperature of the material input end of the mixing screw under a first heating strategy;
and the temperature controller adjusts the temperature of the mixing bin to the average value of the temperature of the material output end of the mixing screw and the temperature of the material input end of the discharging screw under a second heating strategy.
By heating the feeding bin and the mixing bin, the controllability of the extrusion screw device is further improved while the plasticity of the materials is improved.
Specifically, a first preset height difference and a second preset height difference are arranged in the controller, wherein the first preset height difference is smaller than the second preset height difference, and height difference adjustment is controlled to be carried out on the height difference of the feeding bin and the mixing screw according to the average particle size of the plastic raw materials so as to accelerate mixing of the plastic raw materials;
the second preset height difference corresponds to the maximum average grain size of the plastic raw materials, the first preset height difference corresponds to the average grain size of the primary mixing materials, and the height difference is adjusted in proportion between the first preset height difference and the second preset height difference.
It will be appreciated that the plastics material is made up of several components, the average particle size for a single component being the component average particle size for that component, wherein the maximum average particle size is the maximum of the component average particle sizes for the respective components of the plastics material.
It is understood that the first preset height difference and the second preset height difference do not affect production, and the second height difference is within a variable range of a feed inlet arranged in the feed bin, and the variable range is adjusted according to the feed inlet, and can be any value not exceeding the height of a bin chamber of the feed bin.
Specifically, a first preset inclination angle and a second preset inclination angle are arranged in the controller, wherein the first preset inclination angle is smaller than the second preset inclination angle, the inclination modes of the first preset inclination angle and the second preset inclination angle take the material output end of the mixing screw as an origin, the first preset inclination angle is a negative value, and the controller adjusts the mixing screw to the corresponding inclination angle according to the height difference so as to avoid the blockage of the primary mixing material in the mixing screw;
the first preset inclination angle corresponds to a second preset height difference, the second preset inclination angle corresponds to the first preset height difference, and the inclination angle is inversely proportional to the height difference and proportionally corresponds to the height difference.
The absolute value of the first preset inclination angle is smaller than the second preset inclination angle, when the first preset inclination angle is used, the material inlet end of the mixing screw is lower than the material outlet end, and the discharging is carried out only by extrusion of the screw, at the moment, the discharging efficiency is reduced, and the discharging particle size is reduced;
specifically, the controller adjusts the inclination angle of the discharge screw according to the working efficiency of the blow molding machine to adjust the discharge rate, wherein,
if the working efficiency of the blow molding machine is higher than the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is low, and adjusts the inclination of the discharging screw to a second preset inclination angle taking the material output end of the discharging screw as an original point;
if the working efficiency of the blow molding machine is the same as the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is in a reasonable range;
if the working efficiency of the blow molding machine is smaller than the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is high, and adjusts the inclination of the discharging screw to a second preset inclination angle taking the material input end of the discharging screw as an original point.
The discharging speed is controlled on the premise of unchanged feeding speed by adjusting the height and the angle of the screw machine, and the problems of sticking and jamming of the extrusion screw device are effectively eliminated, so that the controllability of the extrusion screw device is further improved.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An extrusion screw apparatus for a blow molding machine, comprising:
the feeding screw is provided with threads according to a feeding strategy and is used for mixing plastic raw materials to form a primary mixed material;
the feeding bin is arranged at the tail end of the feeding screw rod and used for receiving the primary mixed material and heating the primary mixed material by a first heating strategy;
the mixing screw is connected with the feeding bin, and threads are arranged in a mixing strategy to refine the primary mixed material so as to form refined material;
the mixing bin is arranged at the bottom of the mixing screw and used for receiving the refined material and heating the refined material by a second heating strategy;
the discharging screw is connected with the mixing bin, is provided with threads according to a preset discharging strategy, and is used for extruding the refined materials to form blown plastics and extruding the blown plastics into a die;
the temperature controller is connected with the feeding screw, the feeding bin, the mixing screw, the mixing bin and the discharging screw and used for detecting and adjusting the temperature of the feeding bin and the mixing bin;
the screw support frame is a step-shaped support and is used for supporting the feeding screw, the feeding bin, the mixing screw, the mixing bin and the discharging screw, and the screw support frame can respectively lift all parts by a preset lifting strategy;
and the controller is connected with the temperature controller and the screw supporting frame, and is used for controlling the lifting of the screw supporting frame according to a preset lifting strategy and adjusting the temperature of the feeding bin and the mixing bin according to the temperature of the discharging screw.
2. The extrusion screw device for a blow molding machine according to claim 1, wherein the feeding strategy is to set the pitch and the profile of the screw threads according to the average particle size of the plastic raw material and the average particle size of the preliminary mixture, the mixing strategy is to set the pitch of the screw threads according to the average particle size of the preliminary mixture and the average particle size of the fine mixture, the first heating strategy is to adjust the temperature of the feeding bin according to the temperature of the feeding screw and the temperature of the mixing screw, the second heating strategy is to adjust the temperature of the mixing bin according to the temperature of the mixing screw and the temperature of the discharging screw, the fine mixing is to reduce the average particle size of the preliminary mixture by cutting and extrusion, and the preset lifting strategy is to adjust the height difference between each screw and each bin according to the working efficiency of each screw and the blow molding machine;
wherein, for the feeding strategy, the thread form angle of the corresponding thread is in direct proportion to the hardness of the plastic raw material, the pitch of the thread is in direct proportion to the average particle size of the plastic raw material, and for the mixing strategy, the pitch of the corresponding thread is in direct proportion to the average particle size of the primary mixing material.
3. Extrusion screw apparatus for a blow molding machine according to claim 2 wherein each screw has a heater within the screw and in the housing, and each screw is capable of opening the housing from a horizontal direction;
when the screw threads of each screw rod are arranged, the screw thread interval from the material inlet end to the material outlet end is uniformly reduced in the corresponding screw thread interval according to the distance between the screw thread interval and the material outlet end;
the thread interval is an interval between the maximum thread interval and the minimum thread interval of each screw rod.
4. An extrusion screw apparatus for a blow molding machine according to claim 3, wherein the feed screw sets the pitch of the flights according to the average particle size of the plastic raw material and the average particle size of the preliminary mixture, wherein the maximum pitch of the flights corresponds to the average particle size of the plastic raw material and the minimum pitch of the flights corresponds to the average particle size of the preliminary mixture;
the mixing screw is used for setting the pitch of the screw threads according to the average grain size of the primary mixing material and the average grain size of the refining material, wherein the maximum pitch of the screw threads corresponds to the average grain size of the primary mixing material, and the minimum pitch of the screw threads corresponds to the average grain size of the refining material.
5. The extrusion screw device for a blow molding machine of claim 4, wherein the feed bin comprises a feed inlet and a discharge outlet, wherein the feed inlet is disposed at the end of the feed screw and sleeved on the feed screw, and the discharge outlet is disposed at the bottom of the feed bin and connected to the material inlet end of the mixing screw.
6. The extrusion screw apparatus for a blow molding machine according to claim 5, wherein the mixing bin comprises a mixing hopper and a sweeping plate, wherein a mixing hopper top is arranged at the bottom of the tail end of the mixing screw for receiving the fine material, the mixing hopper bottom is connected with the material inlet end of the discharging screw and is provided with a valve for closing under the suspension operation working efficiency to save raw materials, and the sweeping plate is arranged in the mixing hopper and is of a screw-shaped structure for extruding the fine material into the discharging screw;
and the work efficiency of the pause work is that the blow molding machine stops working.
7. The extrusion screw apparatus for a blow molding machine of claim 6, wherein the temperature controller adjusts the temperature of the inlet bin to an average of the temperature of the material output of the inlet screw and the temperature of the material input of the mixing screw under the first heating strategy;
and the temperature controller adjusts the temperature of the mixing bin to an average value of the temperature of the material output end of the mixing screw and the temperature of the material input end of the discharging screw under the second heating strategy.
8. The extrusion screw device for a blow molding machine according to claim 7, wherein a first preset height difference and a second preset height difference are provided in the controller, wherein the first preset height difference is smaller than the second preset height difference, and the height difference between the feeding bin and the mixing screw is controlled to be adjusted according to the average particle size of the plastic raw material so as to accelerate the mixing of the plastic raw material;
the second preset height difference corresponds to the maximum average particle size of the plastic raw material, the first preset height difference corresponds to the average particle size of the primary mixing material, and the height difference is adjusted in proportion between the first preset height difference and the second preset height difference.
9. The extrusion screw device for a blow molding machine according to claim 8, wherein a first preset inclination angle and a second preset inclination angle are set in the controller, wherein the first preset inclination angle is smaller than the second preset inclination angle, and the inclination modes of the first preset inclination angle and the second preset inclination angle are both with the material output end of the mixing screw as an origin, wherein the first preset inclination angle is a negative value, and the controller adjusts the mixing screw to the corresponding inclination angle according to the height difference so as to avoid the blockage of the primary mixing material in the mixing screw;
the first preset inclination angle corresponds to the second preset height difference, the second preset inclination angle corresponds to the first preset height difference, and the value of the inclination angle is inversely proportional to the value of the height difference and corresponds to the first preset height difference in proportion.
10. The extrusion screw apparatus for a blow molding machine according to claim 9, wherein the controller adjusts the inclination angle of the discharge screw according to the working efficiency of the blow molding machine to adjust the discharge rate, wherein,
if the working efficiency of the blow molding machine is greater than the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is low, and adjusts the inclination of the discharging screw to the second preset inclination with the material output end of the discharging screw as an origin;
if the working efficiency of the blow molding machine is the same as the efficiency of the plastic raw material input into the feeding screw, the controller judges that the discharging speed of the discharging screw is in a reasonable range;
if the working efficiency of the blow molding machine is smaller than the efficiency of the plastic raw materials fed into the feeding screw, the controller judges that the discharging speed of the discharging screw is high, and adjusts the inclination of the discharging screw to the second preset inclination taking the material input end of the discharging screw as an origin.
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| CN202310856774.3A CN116572498A (en) | 2023-07-13 | 2023-07-13 | Extrusion screw device for blow molding machine |
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| CN202310856774.3A CN116572498A (en) | 2023-07-13 | 2023-07-13 | Extrusion screw device for blow molding machine |
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